How to Sterilize Surgical Instruments: A Step-by-Step Checklist for Medical Facilities

When This Checklist Applies

If you're managing a clinic, surgical center, or hospital that uses hologic medical devices, surgical energy devices, or even CPAP machines—the same sterilization principles apply. This isn't a theoretical overview. It's a checklist I've refined after overseeing instrument reprocessing during multiple emergencies.

Before we get into the steps, a reality check: sterilization guarantees don't mean much if your instruments are still visibly dirty. Sterilization is only as good as the cleaning that comes before it. Here's the workflow I've found works best, broken down into five steps.

Step 1: Pre-Cleaning at Point of Use

This step happens in the operating room or procedure room. You don't wait until the instruments get to the reprocessing area.

What to do immediately

• Wipe instruments with a water-soaked, lint-free cloth to keep blood and tissue from drying.
• If you can't clean right away, place instruments in a covered container with a neutral pH enzymatic foam or a moist towel. Don't—don't—soak them in saline. Salt causes corrosion, especially on hologic selenia detectors or other delicate electronics.
• Transport them to the decontamination area in a closed, puncture-proof container.

I've seen teams skip this step because they're in a rush. In 2023, our facility almost ruined a $20,000 hologic medical device because someone left it on the back table for 90 minutes before starting decontamination. The dried bioburden took aggressive scrubbing to remove and scratched the surface. The repair cost $2,500. That's a lot more than the 30 seconds it would've taken to spray it down.

Step 2: Manual Cleaning

Automated washers are great, but you still start by hand. Actually, especially if the instrument has lumens (hollow channels) or crevices—you'll miss things in an automated process without a manual pre-wash.

How to do it

• Disassemble the instrument. Any piece that can be separated, separate it. This is non-negotiable.
• Use a soft-bristled brush—never steel wool or an abrasive pad. Your goal is to remove all organic material without damaging the instrument surface.
• Pay attention to:
• Joints and hinges
• Inside lumens (use a lumen brush sized to fit)
• Under screws and

(I should add: the water temperature matters. Use water at around 22-30°C. Hotter than that, and protein-based blood starts to coagulate and stick to the surface.)

After scrubbing, rinse thoroughly with clean water. If you see any residue, scrub again. Don't move forward until the water runs clear and the instrument looks clean.

A quick note on surgical energy devices—those with built-in electronics have special cleaning considerations. I'll get into that in the next steps.

Step 3: Automated Cleaning and Disinfection

This is where the washer-disinfector does most of the heavy lifting. But—and this is a common mistake—the process only works if you follow the load instructions.

What to verify

• Use the appropriate tray or rack for each instrument type.
• Make sure lumens are connected to the irrigation system. If they aren't, they don't get cleaned internally.
• Check that all joints are in an open position. A closed hinge will trap soil even through a wash cycle.
• Run the correct cycle for the instrument. Not every instrument is compatible with every cycle temperature or chemistry.

Here's where my perspective changed. Everything I'd read about sterilization said the machines do all the work. In practice, I learned the operator still sets the outcome. We had two months in 2024 where our records showed consistently high ATP readings from lumened instruments post-wash. It wasn't the machine—it was staff not checking that irrigation tubes had actually connected. A simple visual fix solved it.

When I compared our mid-2023 and mid-2024 quarterly reports side by side—same washer-disinfector, same instruments, but different users—I finally understood why this step is the most critical hour of the entire process. A 30-second oversight at this stage invalidates everything that follows.

Step 4: Packaging and Sterilization

This is where many of you might check out, thinking "we have an autoclave, we're fine." But sterilization parameters vary by instrument, material, and sterilizer type.

Key decisions

• Which sterilization method?
• Steam (autoclave): Most common. Works for heat- and moisture-stable instruments.
• Hydrogen peroxide gas plasma: For heat- and moisture-sensitive items (some hologic medical devices require this).
• Ethylene oxide (EtO): For items that can't handle heat or moisture, but requires long aeration.
• Liquid chemical sterilant: Only for immediate use scenarios (same day, same procedure).

Let's talk about steam sterilization since it's the most common. Parameters depend on the cycle type:

• Gravity displacement: 121-123°C for 15-30 minutes
• Pre-vacuum: 132-134°C for 3-18 minutes (most common for wrapped instruments)
• Dynamic air removal: 132-134°C for 3-4 minutes

Note: these are guidelines. Follow your autoclave manufacturer's instructions and the instrument manufacturer's instructions. If there's a conflict, go with the stricter requirement.

One piece of advice: don't overload the sterilizer. ¹ Sterile wraps need space for the sterilant to reach all surfaces. Packing the chamber to capacity might save time on paper, but it increases the risk of incomplete sterilization.

Had 10 minutes once to decide whether to run a partially loaded sterilizer or wait for more instruments to arrive. The temptation was to wait—but the last time we chose that, the charge nurse pushed to add items after the cycle had already started. The entire load had to be re-sterilized because it compromised the chamber's air removal cycle. The compromise was a $600 loss in disposable wrap costs and a 45-minute delay.

Step 5: Storage and Handling — The Part Everyone Forgets

Sterilization doesn't matter if you contaminate the instrument before use. But how many times have you seen someone grab a wrapped instrument by the edge of the peel pouch and tear it open incorrectly, or store wrapped instruments on a shelf near the sink?

What to watch for

• Store wrapped instruments in a clean, dry, temperature-controlled environment.
• Keep them above floor level (minimum 8-10 inches).
• Don't store anything under sinks or near water pipes.
• Inspect packages before use: if the wrapper is torn, wet, or compromised in any way, it's not sterile.
• Check the sterilization indicator. If it didn't change color or the printout shows a failed cycle, don't use the instrument.

On CPAP machines: these aren't surgical instruments, but they're shared between patients in some settings. You should wipe down the exterior with an EPA-registered disinfectant. For the internal components, follow the manufacturer's guidelines. Some models have replaceable filters—other parts aren't user-serviceable.

As for surgical energy devices, I've seen people assume they can be autoclaved when the manufacturer requires low-temperature sterilization. You can't cut corners on sterilization just because it's inconvenient. A misprocessed device can still look clean but may transfer pathogens to the next patient. Oh, and check whether your specific hologic device is compatible with hydrogen peroxide plasma—some models' seals degrade in that environment.

Common pitfalls

• Assuming tools are sterile because the indicator dot changed color. The indicator tells you the package went through the cycle—it doesn't confirm sterilization of the instrument inside.
• Re-using disposable instruments to save cost. This is a huge non-compliance risk.
• Not documenting the cycle parameters for traceability.
• Leaving instruments in the sterilizer after dry cycle ends (moisture condensation can compromise the wrapper).

Standard print resolution requirements: A print resolution of 300 DPI at final size is standard for commercial offset printing. For large format posters viewed from a distance, 150 DPI is often acceptable. These are industry-standard minimums. This matters if your reprocessing team creates their own instructions—they should be clearly legible.

Quick note on unit conversions: 24 lb bond paper = 90 gsm, which is a bit lighter than what you'd use for printed SOPs (stick with 100-120 gsm for durability). The weight matters if you're laminating your checklists for use in wet environments.

What Actually Changed for Us

Our facility formally implemented a 'sterile storage audit' procedure in 2023 because of a near-miss event. A pack had been stored on a lower shelf that got splashed during a floor mopping. The outer wrap looked fine, but when we peeled it open, the inner chemical indicator was smudged from moisture intrusion. The instrument was re-processed, but that moment made everyone more careful.

You don't need to get it perfect the first time. You need to get it clean, followed by sterile, followed by stored correctly. That's a step-by-step workflow you can start using Monday morning.

Industry standard color tolerance is Delta E < 2 for brand-critical colors. Delta E of 2-4 is noticeable to trained observers; above 4 is visible to most people. (Reference: Pantone Color Matching System guidelines). Not directly related to sterilization—but if you're labeling your instruments with color-coded tape, the colors need to be distinguishable under normal lighting.

In my role coordinating instrument reprocessing for a surgical center, I've handled over 500 instrument sets, including some that needed emergency re-sterilization mid-procedure. When I'm triaging a reprocessing order, the first question I ask isn't "how clean is it?" but "how dirty did it start?" That simple reframe changed our manual cleaning outcomes more than any equipment upgrade.

Start with these five steps. If you implement one correctly this week, you'll reduce your reprocessing failure rate. That I can say from experience.